Air heating and circulating unit



Jano l, l R. S. ARNOLD AIR HEATING AND CIRCULATING UNIT Filed Aug. 31, 1926 Suma,

I TI Patented Jan. l, 1929.

UNITED STATES l l 1,697,627 PATENT OFFICE.

ROBERT S. ARNOLD, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO YORK HEAT- ING AND VENTILATING CORPORATION, F PHILADELPHIA, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

AIR HEATING AND CIRCULATING UNIT. i

Application led August 31, 1926. Serial No. 132,807.

The present inventionrelates to heating and Ventilating apparatus and more particularly to a circulating air heater' for use in factories, garages or any other rooms where it is desirable to produce frequent changes of air and maintain the room at a desired temperature.

Some of the objects of the present invention are to provide an improved heating;`

l0' unit; to provide means in a single compact unit for removing poisonous gases and vitiated air from a room and replacing with pure heated air; to provide a heating unit wherein either fresh heated air can be sup- 'l5 plied to a room or recirculated and reheated air can be supplied thereto; to provide a unitary structure for simultaneously removing tainted air from a room while circulating fresh air in the room; to provide a common and related exhaust and circulating means for air heaters of the unit type; and to provide other improvements las will hereinafter appear.

In the accompanying drawings, Fig. 1 represents a side elevation' partly broken away of a heating and Ventilating unit embodying one form, of the present invention; Fig. 2 represents an end eleva-tion of the same; and Fig. 3 represents'a section on line 3-3 3o of Fig. 1.

Referring to the drawings, one form of the present invention consists of a casing 10,

preferably of generally rectangular shape and provided with an'exterior shelf 11 which 'is used in this instance to support a motor 12, though any other supporting means for this purpose may be provided.

In order to separate exhaust gases and products from ure air being heated and circulated, the casing 10 is subdivided bya vertical partition 13 lnto an exhaust passage 14 and a heating'chamber 15 which are entirely without communication one with the other.

For withdrawing and expelling exhaust gases and vitiated air from the room in which the unit is located, the lower end of the passage 14 communicates with the room by way of an inlet opening 16 located at the approximate Hoor level of the'casing 10, while the upper end of the passa e 14 communicates with an exhaust duct 17 eading to an outlet 18 which in some instances may be above the roof 19V and in other instances projecting laterally through a wall 20, as indicated in dotted lines. An 'exhaust fan 21 is located 55 I at the inlet end of the duct 17 where it is fast to a shaft 22 extending longitudinally of the casing 10 and driven by the motor 12. Cont-rol of the passage 14 is had by a manually operable damper 23 arranged in one posi- 60 tion to establish communication between the passage 14 and the room, and in its other position to cut off such communication.

For circulating air through the chamber 15 and delivering it to the room in which the 65 unit is located, the lower end of the chamber 15 communicates at one side with the room by way of an inlet opening 24 located at the approximate floor level of the room, and at the other side with a duct 25 by way of an 70 inlet 26. The duct 25 leads to an outside source of fresh air and as shown passes through the wall 2() where its inlet is protected` by a suitable screen 27. The upper end of the chamber 15 communicates with the 75 room through one or more warm air conduits 28, two being here shown and each of square section so that the direction of the discharged warm air can be changed as desired according to conditions. Generally one of these conduits 28 is positioned to discharge the air in one direction and the other positioned to discharge it in another direction, as shownin Fig. 1. Exhaust fans 30 and 31 are respec. tively located at the inlet ends of the con- S5 duits 28 and are here shown as driven by the same shaft 22 as the fan 21.

Control of the inlet openings 24 and 26 is preferably had by a common damper 32 which is attached to a rock damper rod 33 so 90 that in one. position it closes the inlet 26 and establishes communication between the chamber 15 and the room by way of inlet opening 24, and in its other position closes inlet opening 24 and establishes communication be- 95 tween the chamber 15 and the outside air by way of the duct 25 and the inlet 26.k In the one instance the air of the room is recirculated through the chamber 15 and in the other instance fresh air is circulated through the chamber 15.

For the purpose of heating air passing through the chamber 15, heating coils 34 are mounted in the chamber 15 in the direct path of air entering at the bottom by way of either of the inlets 24 and 26. The coils 34 are provided with connections 35 extending exterior of the casing 10 to receive and allow circulation of exhaust steam or any other medium u sed for heating the coils as will be understood. Also the coil arrangement-is of the staggered type whereby the air passing through the chamber 15 is retarded and caused to follow a tortuous path to absorb the maximum heat units.

In operation the dampers 23 and 32 are so set as to cause the air circulating and heating unit to function most efficiently under the conditions existing in the room in which it is located. For example, if the unit is in a garage where there is more or less continuous running of engines itis desirable to clear the room of the exhaust gases as quickly as possible and replace them with pure air, and under this condition the damper 28y is open to provide an inlet at the fioor level to the stack or duct- 17, while the damper 32 is moved to close the inlet from the room to the chamber 15 and open the inlet 26 from the fresh air duct .25 to the chamber 15. With the dampers 23 and 32 so arranged, the motor 12 is started to simultaneously operate the exhaust fans 21, 30 and 3l and as these fans are designed to proportion the rate of exhaust to the rate of circulation for maximum results, it will bc seen that an efficient withdrawal of tainted air and poisonous gases takes place so that the air of t-he room 1s not only maintained pure but at the desired temperature.

On the other hand, if the unit is located in a room relatively free from obnoxious gases heat units may be conserved by temporarily closing the damper 23 to cut off communication between the stack or duct 17 and theL room7 and turning the damper 32 to its posltion cutting off communication with the fresh air duct 25 and establishing communication between the chamber 15 and the room, whereby the air in the room is recirculated and heated and the collection of dead air prevented. p

I't will now be apparent that a complete unitary air circulating and air heating constructlon has been devised whereby the air in a room is either being constantly replaced by fresh heated air or is being constantly redistributed a'nd-revivified and as a result the room wherein the unit is located is maintamed at the proper temperature and free from obnoxious gases.

Having thus described my invention, I claim: i

1. A unitary heating installation comprising in combination a casing, a. partition forming with said casing an exhaust passage and a heating chamber, an inlet to said passage for establishing communication with the outside of said easing, a discharge duct leading from said passage, an air inlet to said chamber, a discharge outlet from said chamber, heating coils in said chamber and supported by said casing, and means for simultaneously drawing vitiated air through said passage, and circulating air about said heater and throuUh said chamber.

2. unitary heating installation comprising in combination a casing, a partition forming with said casing an exhaust passage and a heating chamber, heating coils in said chamber and supported by said casing, and means including a plurality of fans for simultaneously removing the air from the 'room in which said casing is located by way of said exhaust passage, and .circulating other air through said chamber about said heating means to replace said removed air.

3. A unitary heating installation comprising in combination a Casin g, a partition forming with said casing an exhaust passage and a heating chamber, said chamber having an inlet from the room containing said casing and an inlet from an outside source of air, manually operable means for controlling said inlets whereby one or the other is caused to function, a heating means in said chamber, and means for simultaneously removing the air from said room by Way of said exhaust passage and circulating other air through said chamber about said heating means to replace said removed air.

4t. In a device of the character stated, the combination of a casing, a partition forming with said casing an exhaust passage and a heating chamber, said exhaust passage and said chamber l'iavinginlets respectively in close proximity to the Hoor line of the room containing said casing, a stack duct leading to the atmosphere from said passage, ducts arranged to discharge air from said chamber in more than one direction, heating coils in said chamber, and fans for respectively discharging air from said passage Aand said chamber to the respective ducts. i

5. In a` device of the character stated, the combination of a casing, a partition forming with said casing an exhaust passage and a heating chamber, said exhaust passage and said chamber having inlets respectively in close proximity to the floor line of the room containing said casing, a stack duct leading to the atmosphere from said passage, ducts arranged to discharge air from said chamber in more vthan one' direction, heating coils iu said chamber, fans for respectively discharging air from said passage and said chamber to the respective ducts, and means for controlling the respective inlets.

Signed at Philadelphia, county of Philadelphia, State of Pennsylvania, this 25th dav of August, 1926.

ROBERT S. ARNOLD 

